I had kind of the same exact issue a couple years ago, probably a few months or so after I had joined the community. Of course I freaked out because I didn't know what was going on and relogging wasn't helping the situation, my character wasn't running in the direction of my camera (which I could still use the arrow keys to turn the camera), the character would run in whatever direction it got stuck facing while the head would follow the camera. If this is what you're experiencing, the only fix I know of is pressing one of the ctrl keys to change the running modes. Reinstalling might fix it, but if for some reason it doesn't then this has me stumped. I remember how hard and irritating it was to try and steer with the A and D or whatever keys, so I hope this isn't driving you as crazy as it drove me.
However if I might add, it could have something to do with your hotkeys.cfg file in your game's FH folder, maybe try looking it over just to be safe? And if there is something wrong with it for some reason, there's a way to download the default file.